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| author | David Woodhouse <dwmw@amazon.co.uk> | 2023-08-30 20:59:43 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2023-10-04 12:25:17 -0400 |
| commit | 886e0a5f31bf3d40dd8d9199674a4bad64942fde (patch) | |
| tree | 8aaaa69ed13e078bd1b96ff8d6e9fd68cbb5c8e0 /target | |
| parent | 3d123a8b411706423581db7d26a7bbe548360751 (diff) | |
| download | qemu-886e0a5f31bf3d40dd8d9199674a4bad64942fde.zip qemu-886e0a5f31bf3d40dd8d9199674a4bad64942fde.tar.gz qemu-886e0a5f31bf3d40dd8d9199674a4bad64942fde.tar.bz2 | |
hw/isa/ich9: Add comment on imperfect emulation of PIC vs. I/O APIC routing
As noted in the comment, the PCI INTx lines are supposed to be routed
to *both* the PIC and the I/O APIC. It's just that we don't cope with
the concept of an IRQ being asserted to two *different* pins on the
two irqchips.
So we have this hack of routing to I/O APIC only if the PIRQ routing to
the PIC is disabled. Which seems to work well enough, even when I try
hard to break it with kexec. But should be explicitly documented and
understood.
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Message-Id: <112a09643b8191c4eae7d92fa247a861ab90a9ee.camel@infradead.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'target')
0 files changed, 0 insertions, 0 deletions